Sudoku is a logic-based number-placement puzzle. The objective is to fill a 16 16 grid with digits so that each column, each row, and each of the nine 4 4 sub-grids that compose the grid contains all of the digits from 1 to 9. The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a unique solution. This sudoku puzzle book contains easy levels of difficulty and suitable for seniors. Find some puzzles to hard?...
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